SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe87fbde5391687bc1d4c4d0e0f11534463202191736f08981cfe2f6f97117e1' 
  AND token = 'EY9c5lIA6rH6vX/Qlnz/+cQxAV/gTXzEFSSKxAPU1Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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