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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '662f4ed0108a965418806ab365ba4cd69c5f8f4b9e1f8ef58a96df0a4be51121' 
  AND token = 'mtz5cOBJ6BdvsFxous3EKdibglp76kFV+VlEEDNqSQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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