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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2f8082e04a09a0ab9883908901ba995e5e2b9a973e8f75599a1712e630fc31a' 
  AND token = 'NazEApM6lzHnf1uPZi0YkYHjbgA3H39eBVvZuDiVKEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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