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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '511c698dd27b884ae537072c1702ad7f52bd3317f3b7541b6d70c27de33f412b' 
  AND token = 'e5A63TGRQ4GrEyz/nUBjp5UJSHtEI3RRymhuNXvwchI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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