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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38000ba4107261bb5b4c7d7478c01a05f23bcd3802c0c88b3e4d3bbf1b36ddd9' 
  AND token = 'qbNb+fjwSWkPslsB8WkUqWZumlkx1PRy1nfGmVedwK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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