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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0beaf8a616571773a1110e0ba7d3fc7a0641c001e2ea946bc22ffd141f6a4589' 
  AND token = 'suTcrJfHrgIiFT/YQj7XnLaWjSsezcUIhxcjjcWe3aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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