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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3139df5c20ae0450cf6985401f3cdd8f0d583d3ce25ac596b82678ac000e4a6a' 
  AND token = 'DDKxUi+QvoJgl6988ibDiXQJ74PaQBEH/prbeZHlS7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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