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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f8efc8021adcb2af82a5f798a00fef372102b46159e028e52ce000b973331e1' 
  AND token = 'wNbrKvsCpdKoZXS9VZxnu7I93xLADvHWJvrHr467PXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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