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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db37db474f96e9450a33d02eda27ca121682f23d42c7270e2bf4ea557ec58de2' 
  AND token = 'BtbfXtHlMmEQ+y4iIH1iHxTxE7aXodkpO7d5ZMhL0lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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