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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c537db3c8178e9acc7e8d3ee8b9703bb1d633c34d7658945b46cc671958d681' 
  AND token = 's8sclNtah3UrDvbYJbVAYOipKy9DiQ4l2dpm69wEiNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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