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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba7171dec15e0d875f40f3aeaa1e9d67e811418b2723d6eb0d22ddc93b57460a' 
  AND token = '1A7ogQW7Pe6QWVIHxdi2JGrVLM34AdeShKis6Ue/nxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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