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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c23db6d4ad2e162d18dd93a8fc49fc0ac859a3e5d1ee7066830249a69ed5a2e0' 
  AND token = 'vw6d2uZYg1Fro5SsxeIuD5DyKJpR8k//23iWS3WtunQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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