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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bc59eb4f4992bbe7047fc9fe959bf98f78b96d41d949ba5789e3b27a91b8d36' 
  AND token = 'uHkdLuNfyY2GpmQNM6zOmTgLL+fGBxQcbeanqEyGANo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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