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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4e6c583596ef869fc9ea79c75e133e0b7e30afdb8616c319b44fac0a035cacd' 
  AND token = 'V3lyWj2OTFNTTn0o9RbxvXhcKUzhXrd//Aipal5qIpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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