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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69b1dbcda79fb8d04b63eda24cdfb17cd9f57bcfb0e0d9ec5e98d2f697215a42' 
  AND token = 'ubitRO8W8tvgDWF3miYKgIn4yDiLuS3WhEV71/fpLT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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