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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6a49592056e207a63007f85c7c2fe38857b1a044e690f2e16b00a8fdb2c021d' 
  AND token = 'an601ig9LmpYv9OX764sNxlkjF3DNRLt3+IrsKpBHv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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