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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c08d4f51c5cef36ad248b6f5fa48f7b4d179310ef80aed01d73e530e281a76a' 
  AND token = 'Y8NEqj3dZB3RVQ7I2xAk/0Mr+tDmlmX5saI91u+2Vi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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