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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4aa77e5ab0df41fd3c5d39425a6f78fa8f709452f445498ae882b5d2d3846bc8' 
  AND token = 'juDhfA5qaacLKs4+DJ8s6gYxGs/0aNjPWSZij42Q0js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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