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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b6eea52afe3f1000fd3f29f7c92830059e95c2821cb7395c8f381fae723ed75' 
  AND token = 'Z7blxDbmcVcI3tOsZBYRfG7YTT0AJozgWJwJtLFRAHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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