SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c11834d4698cc5f9810457cd44ad93b66f9505a03157d97287b3cb52923507df' 
  AND token = 'JUZarbu86TBGQct/bfUK0yZwOELYL3vbiL52MK3wyFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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