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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abf8f0ef882772b8277f9221fdacccd5caa110594844fc6f2a29b148b0f8147b' 
  AND token = 'CKoYqRn0kfDUS0bfzViNUsQ0vJidwVFaulrIxoC9bAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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