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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69c8c39bd63dbbf6df75ad81c616e3fafd582e062feb9b45068e31a43f069b9b' 
  AND token = 'C9Ge9ogkcv3cNIbUQ30X98iWq8l/xGWDjgrvOxbzCyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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