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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99c86657d6abe884778439d92e0137b91798fcd5da60be7cbd100252ef43c68d' 
  AND token = 'ZmOWDwbzuw8RDpWtfFg6h0765mgm7Or1fS6snfLsjV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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