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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '336eff19d2cdc241181146e52ee6848eeda547c9e2cfb72cb9a7041db4f87f75' 
  AND token = 'wi6rWkGe73Cf3VInaPO1ughWvrAo05TIEGNSvFLCq1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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