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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b075119f8d07d324b5b2a5a4d34cefa221bfcea0ffe5e7b7350142c067f835dd' 
  AND token = 'yiIuvewVMEg1lazPs0hdy2941jk9GNF18343o3ptVMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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