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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f93c39152b9c09c1a14df4d6964ca112e4a4ecad055cbecfe740a86951338f99' 
  AND token = 'uMLmpygPsPjC/8cBIXlul/e7ZChrOpkqp4qeCKm1YdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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