SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4007b74cf6ecfd2085d946047b749cd08ba50e051942746cbfe0b86fcf2c14f' 
  AND token = 'jK/prhicIg/r/PUzxJcIhKRZ/nGZhVz1GeD28XiQp6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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