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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '170027d80eb306a31a91585ba74eb61b71b74433d2b878ca822c381961304a0d' 
  AND token = 'xfmE15GWXJYQxGiF7h31RC6m7ELNSb4MuBNFnusb+eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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