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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00eb864ce208249978c81bc9a295feb7cfac9a8a4cfeb0d00d51a21f44f2ed33' 
  AND token = 'V+eVvOLxTSIB4UmPIkfW+6B8bVjrGFRAEuVLaQhHOHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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