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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38f5ecfd8aa41709238d784919c3eecf2c54d9394b60f15646fa9dfe0108d470' 
  AND token = 'KNbEPNtrp/gmEMesCVOGWQsd9B68vvrmsP9P+6zzbL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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