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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e65f474f5b7ee5ee96283e24938d86643fe7ad8ba39d5294e52f6525c7aba2e' 
  AND token = 'xHA+6lr8R7DjoT2LuqLlhP4MutdKXtcV5P8z9Gytcys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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