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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbc52890a9a4baef44e4dcae04bf11d7e49a076adc42c888e44f614b9fd98729' 
  AND token = 'x7JFxvCB7Dkbq9+HHJA6tsdi+dSyAW07yk7kYxqfRb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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