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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0af8ac754e265db3eb7e9385467345d3333c5d986b861b44c5c65c4778bc8734' 
  AND token = 'nZ/c5OsmnEC/DVMGuul1aGSy7Iuqxs1AKuWlJhHDoQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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