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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a5a8cd7a72755a547a30e0453a728e4d4a437e6bb1a55e96945e3da267b411f' 
  AND token = 'oJKjMxm5FCx7jwU2O9mCoi1TqXqfihZ8b2D42h3U8DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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