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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1af4b32ffed0cea0de597145bcf58491d2afcb705bf65feb1a4ea52e6d52d3d2' 
  AND token = 'A3eYq9aKZiuGwBHZdL+FIMuBHzcCdUypLK0VYeL9S3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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