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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df9d85c79727aa35a396b00292ad32c3443ee377d66c4e2920389e69301f745e' 
  AND token = 'oNIXoy4kko5egQMleUw28vwyZX15eA2b6RPl6CiLHtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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