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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f14a06ce09aa2b123df49ff45744ec7db2e7aa1ef85fd2026888ea0fe00376d3' 
  AND token = 'JR2Et/KtpduVmUCcurU6WCWsrlLScFV7N0EzSxWR9dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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