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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e9ea0eaac4ea258ebe86e44b3b4f59c47512668471205c98ac328e6574f22ff' 
  AND token = 'LrkkTXtsoaZoFTafB57Unq8j176XNCRMpquOSPIaKY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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