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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c81102707329d5ab6cac91b1ad2a9e6c6b23133f4e04f4fc52294548d1c15762' 
  AND token = 'py/3is4NpNDczD3uE9kH6fXvlhrvw3NSucrgOkazrVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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