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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de60ce01729a171aa2bbe74ee4035892051d33cf24bb1eeaecd08dcc8f46d645' 
  AND token = 'xvi8t5YX7v3LrwPbXb4eUpVe3362U2HgkSXnIaQzakg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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