SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29ba92d1204ecafa1b6f6648c52958a654922e84e9dcf269bc8b544df989eecc' 
  AND token = 'uJNzyKEhgjhgGyTBYBMSre6UqL7r/PWIGENRvyQdvAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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