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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f4cdd39525b4442fdcbfafbd41a9c448c30beab437318d7eacd8be8c5306143' 
  AND token = 'vTAxtb1Q3e1JuGHdnZxya0y73NngnLImM8d0oK5l/8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}