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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d3a5076ac10df4c37424e31ba77cd977ed718b4e68480cbcb08da3c59070ab7' 
  AND token = '0WKCnY7E+1lXzANqKmHg6McrwssyUBwbbgF6K/sZa7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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