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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69e8aa39786d1d8306d75b8b8db482a1f2fc3fd7cdd33a50fde0dd67a3c39d3f' 
  AND token = 'DYuqOhmtJXegLOApCxerIMvN4m4/jA5Qahq0c6GtjcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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