SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c745d48236cbcb0b891f9f5d68b2f397d6f376b8cb4e2a2fc15a0dd3231eed4' 
  AND token = 'GzoRN1GuTwqHDMCK8ZF+yaAjta4UyuEEB0y7pg5v0T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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