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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'deea151ff1391f43f77e8c325e21a0fae1a5fc60dfebe3a289df228acd5dde04' 
  AND token = 'fWT0GyWqP+1ZVGaunzsw6Wk8KKnJ6lJD92iCKad+yFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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