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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4a4b89f51b10a6ea592280707e263526ec10f267842b8f40ce3be9a9979247b' 
  AND token = 'aIYk/cI67N/UC9XoaWss+JLhqY/6aLhN692dUQ5P/V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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