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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c0c2bbe258199f1be03324eb9f860b574273f82235a863a84f7432f1f0772af' 
  AND token = 'XQSNnJ2XgXbZfW0W+14IWifa6tuOqGp8e5jve+vDxG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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