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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ab00822522e4f410db0ae676f925c7a502ebdea3a911e12c95a28b9aa505194' 
  AND token = '3F4qUMszK9nZcn/aGcNj5lu2jFWCKb1e8yLsFs9e1mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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