SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54f1d007b54b194080240c93f2615a2cfbafccc7676adfc8f55d4fd24632299e' 
  AND token = 'i/1LrCYANORlYfXi3NfTnv4YvPHDbH7w0s+pmCm+hOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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