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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd078d746331a2612244f966563c0d7baaf4a9a640b03a3466cf5c1e589956d8' 
  AND token = 'CmPp8kxuPvgBdlfOYym8FTTbf5yNd4hMHPhWegblCA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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