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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '902eab57d1bcd9c9871564c7ab1895ea230cd60da943a820bf3d3ae04cbc09da' 
  AND token = '7mp4hS3F5FDBjvUbnfLj8Uu+oP9OPzOA9RD1iLGiA/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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