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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed5239a6f2cb17ea7dfa58a92b610ee8244f87934cd040e9a49321269f57b6b9' 
  AND token = 'kjcs88dXyOodRo/NFLJyjUxyOXB6XOt+ytQaXemC04M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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