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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bcff700edb967139b6f988480f28d3ebb7865de98b7dd79ac274896e29582c8' 
  AND token = '5fO/oNdbpBipAgBYtBzeFS3PLLIDSn1Fye2k5TCzfgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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