SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c4d5dc2faf62b357f43e30f2f0cb2c91c3bbc0a12f2701b196e22d145588aa8' 
  AND token = 'orX14um6KiFjwqzEvEZUvAUzeY5qM7dlNTjCdyWG+tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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