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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ea01d445cce4893ea6a258c1fb1eee6ccc78d8d6105541d38a1acd207f2a988' 
  AND token = 'd8lS7p6Cox+1NSxOb8wPNq40MryKLHNdzXjPfZW6ro8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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