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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec8210e099f7740486bfe34d4d762fb503bbc833d2c943064b82aca293b85229' 
  AND token = '3I9WDypNbiJo3OG0ND1Fwt/cwIX4cV8WHlXvGgzdWCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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