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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea2e7021a25ebc9bc0aa7597f25ac5f6369b98ba2568f58d2723d221877ef2ac' 
  AND token = 'BKEiWfEzUYfd+678Bu7Av1skP3lJlygqXOdzUkuARWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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