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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c172210d3decb99c50743cc2cad5615492a5c7261cc2436c6b543870822b615b' 
  AND token = 'yxpuN+1JVKJh0nwsLTejm9dSW2n8NfLKFL+c39J7YEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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